KUU Downloads & RevenueKUU: Overthinking Brain Dump · App Store
KUU - 考えごとが多い人のAIメモアプリ｜ADHDにも
KUU: Overthinking Brain Dump is #55 in Lifestyle Grossing in Japan and charting in 1 of 30 countries we track.
Updated 8 Nov 2026 · rankings refresh through the day
DeveloperShunya Yamashita
CategoryLifestyle
PriceFree
Released
Rating★ 4.5 (1.1k)
Version2.18.2
Age rating4+
First seen by us
27 Sep 2026
27 Sep 2026Installs (est.)50k+ worldwide
KUU: Overthinking Brain Dump update history & changes
Last change · 31 events since 26 May 2026Full timeline ↓✏️New iPad screenshots✏️New screenshots📦Updated to version 2.18.2⭐Passed 1K ratings📈Entered the top 100📦Updated to version 2.18.1⭐Passed 1K ratings📈Entered the top 100🆕First spotted by AppInsider🆕Its developer released another app: DAYPACK: Photo Cleaner, 3 Ways
Full timeline · 31 events
- ✏️KUU: Overthinking Brain Dump: new iPad screenshots· JP
- ✏️KUU: Overthinking Brain Dump: new screenshots8 screenshots (was 10) · JP
- 📦KUU: Overthinking Brain Dump updated to version 2.18.2KUU 2.18.2 をお届けします。
【2.18.2 アップデート内容】
■ 共有の画面が、真っ白にならないように
手放したことを画像で共有するとき、1回目だけ共有の画面が真っ白になることがある問題を直しました。
■ 多いときも、すべて画像に
手放したことが多いと、画像にできないことがありました。20件ずつ何枚かに分けて、すべて書き出せます。
これからも、あたまの中に余白が戻る時間を、そっとお手伝いします。 - ✏️KUU: Overthinking Brain Dump: renamedKUU - ADHDや考えごとが多い人のAIメモアプリ → KUU - 考えごとが多い人のAIメモアプリ｜ADHDにも · JP
- 📈KUU: Overthinking Brain Dump entered the top 100Top Free · Lifestyle · JP
- 📦KUU: Overthinking Brain Dump updated to version 2.18.1Here's KUU 2.18.1.
We've made a few small improvements.
As always, we're here to help a little space return to your mind. - 📦KUU: Overthinking Brain Dump updated to version 2.17.0這是KUU 2.17.0。
【2.17.0 更新內容】
■ 打開iPhone Duo，雙頁展開
打開後的畫面上，左邊說話，右邊看清單。說完之後，四個分類也會在雙頁上橫向排成一排。
■ 四個分類，橫向排開
打開iPhone Duo或橫放iPad時，只要一個按鈕，就能把清單的四個分類橫向排成一排。
■ 選好的檔案夾，保持不變
把清單往下收起，或停止錄音回來後，之前選的檔案夾也會繼續保留。
我們會繼續靜靜地幫你，把留白帶回頭腦裡。 - ✏️KUU: Overthinking Brain Dump: new iPad screenshots· TW
- ✏️KUU: Overthinking Brain Dump: new screenshots10 screenshots (was 10) · TW
- ✏️KUU: Overthinking Brain Dump: new iPad screenshots· JP
- ✏️KUU: Overthinking Brain Dump: new screenshots10 screenshots (was 10) · JP
- 📦KUU: Overthinking Brain Dump updated to version 2.16.1Here's KUU 2.16.1.
We've made a few small improvements.
As always, we're here to help a little space return to your mind. - 📈KUU: Overthinking Brain Dump entered the top 100Top Grossing · Lifestyle · JP
- ✏️KUU: Overthinking Brain Dump: new iPad screenshots· JP
- ✏️KUU: Overthinking Brain Dump: new screenshots10 screenshots (was 10) · JP
- 📦KUU: Overthinking Brain Dump updated to version 2.16.0Here's KUU 2.16.0.
【What's new in 2.16.0】
■ Even if you step away mid-recording
If you open another app or turn off the screen while recording, what you've said so far stays. When you return to KUU, you can keep talking from where you left off.
■ Your list, as usual after a restart
Occasionally, after restarting your iPhone, the first-time guide appeared again and your list looked empty. This no longer happens.
As always, we're here to help a little space return to your mind.… more - 📦KUU: Overthinking Brain Dump: now updating weekly4 updates in 30 days, after a quiet two months
- 📈KUU: Overthinking Brain Dump entered the top 100Top Grossing · Lifestyle · TH
- 📈KUU: Overthinking Brain Dump charting in a new countryThailand
- 📈KUU: Overthinking Brain Dump entered the top 100Top Grossing · Lifestyle · VN
- 📦KUU: Overthinking Brain Dump updated to version 2.15.1Here's KUU 2.15.1.
We've made a few small improvements.
As always, we're here to help a little space return to your mind. - 📦KUU: Overthinking Brain Dump updated to version 2.15.0這是KUU 2.15.0。
【2.15.0 更新內容】
■ 從更新提示開啟 App Store，直達 KUU
從更新提示開啟 App Store 時，現在會正確開啟 KUU 的頁面。
我們會繼續靜靜地幫你，把留白帶回頭腦裡。 - 🆕KUU: Overthinking Brain Dump first spotted by AppInsider#71 in Top Free · Lifestyle · Taiwan
- 📦KUU: Overthinking Brain Dump version 2.14.0Here's KUU 2.14.0.
【What's new in 2.14.0】
■ “Now” on your Lock Screen, easier to read
It now sits on a soft pale-blue background, so it's easy to read even on a bright wallpaper. In Settings under “Lock Screen,” you can switch it to Clear, Light, or Dark.
■ Light or Dark, just for KUU
Under “Appearance” in Settings, you can now choose KUU's look separately from your device setting.
■ The water goes down as you speak
While recording, the water level now goes down with how long you've been speaking, not how loud. It stays still while you're quiet.
As always, we're here to help a little space return to your mind.… more - 🆕KUU: Overthinking Brain Dump: its developer released another app: DAYPACK: Photo Cleaner, 3 Ways
- 🆕KUU: Overthinking Brain Dump released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
4.5 ★
1.1k ratings
Measured
Best rank now
#55
Lifestyle GrossingMeasured
New ratings a week
51
▼ -10% vs the 2 weeks before
Measured
KUU: Overthinking Brain Dump on the App Store
App details
App ID
6771264775
Publisher
Shunya Yamashita
On the store since
May 2026
Under a year
Minimum OS
iOS 26.0+
iPhone 11 and later
Devices
iPhone · iPad · Watch
Universal purchase
Content rating
4+
Languages
33
AR CA HR CS DA NL EN FI FR DE EL HE …
Size
38 MB
Also listed in
Health & Fitness
KUU: Overthinking Brain Dump downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in KUU: Overthinking Brain Dump before Apple and Google take their fee.
How this is calculated
Not in an overall Top Grossing chart, only in category charts: each category position is converted to the overall position it corresponds to, then priced on the same rank-to-revenue curve, inside the part of each market the charted apps leave over.
Business model: Ad-led
How KUU: Overthinking Brain Dump makes money: subscriptions, one-off purchases and ads.
SubscriptionsIn-app purchasesAds · 2 ad networks
Subscriptions
/mo
of revenue
Ads
/mo
of revenue
Top in-app purchases · App Store US, most popular first
| 1 | KUU+ Yearly subscription | |
| 2 | KUU+ Monthly subscription | |
| 3 | KUU+ Lifetime subscription |
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Japan | LifestyleGrossing | #55 |
Apps near KUU: Overthinking Brain Dump on the chart
Lifestyle Grossing, around #55.
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PetMira-Cat Translator&AI Care#51
Home Planner AI：Room Design 3D#52
寿寿-juju- チャット占い で復縁や恋愛相談・恋愛 占い#53
MyScreen - Live Wallpapers#54
Hobonichi Techo App#56
SumOne: For Relationships#57
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Ease - Body & Mental Health#59
ヨイトキYoitoki: Dating & Marriage#60
Ratings
App Store, worldwide.
Rating
4.5 ★
1.1k ratings
Measured
Ratings
1.1k
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
51
▼ -10% vs the 2 weeks before
Recent ratings
4.7★
vs 4.6★ lifetime
Review momentum
77/100
faster than 89% of Lifestyle apps
New ratings by country (2)
| Country | New ratings a week | Share | Last 2 weeks vs the 2 before |
|---|---|---|---|
| Japan | 47 | 92% | – |
| Taiwan | 4.2 | 8% | ▼ -10% |
App Store ratings in the countries we track, 4-week average.
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
About KUU: Overthinking Brain Dump
When your head is full, it can be hard to know what belongs in front of you and what can wait.
KUU is a quiet voice-first app for brain dumps, overthinking, scattered ideas, and the small worries you do not want to keep carrying.
You can speak what is on your mind. It does not need to be organized.
KUU turns what you said into text and gently separates it four ways:
Now / Later / Park / Let go.
The point is not to do more.
It is to make a little room in your head.
■ When to use it
- Before bed, when your mind starts running.
- When the same thought keeps looping.
- When task managers have started to feel heavy.
- When you want to be heard, but do not want to send it to anyone.
- When talking out loud helps you understand what you mean.
- When an idea appears before it has a shape.
- When you do not want to forget something, but it is not ready to act on.
- When voice feels easier than typing.
- When your hands are busy: driving, cooking, getting ready, or moving through the day.
■ The 4 ways
Now — Something that may feel lighter if you look at it soon.
Later — Something to return to at another time.
Park — An idea, feeling, or question that does not need an answer yet.
Let go — A worry or thought you may not need to keep holding.
These are not priorities or scores.
They are quiet ways to hold what you said.
■ How KUU is different
- Unlike a notes app, KUU starts with speaking, not writing.
- Unlike a task manager, KUU does not turn every thought into something to do.
- Unlike an AI chat, KUU does not give long advice or add more things to think about.
KUU receives what you said and separates it into smaller, easier pieces.
■ What you can do
- Speak naturally, even when your thoughts are all mixed up.
- See your words as text.
- See only what needs your attention now.
- Keep later thoughts, parked ideas, and things to let go in their own places.
- Revisit what you have said when you want to.
■ Voice and data
- Raw audio is not kept.
- What you said is saved as text so you can look back later.
- Sorting uses AI. Only your words as text are sent, and nothing is kept.
- Your saved text syncs only to your private iCloud.
- Other people, and the app developer, cannot read it.
■ On your Mac
KUU waits quietly in the menu bar.
You can speak without opening a window, and it carries all the way through to
Now / Later / Park / Let go.
What you said before is always a glance away.
KUU is not here to add more thoughts.
It is here for the space between:
“I do not need to solve this right away”
and
“I do not want to keep holding it in my head.”
— Speaking makes room in your mind.
Terms of Use: https://kuu-zen.com/en/terms/
Privacy Policy: https://kuu-zen.com/en/privacy/
KUU is a quiet voice-first app for brain dumps, overthinking, scattered ideas, and the small worries you do not want to keep carrying.
You can speak what is on your mind. It does not need to be organized.
KUU turns what you said into text and gently separates it four ways:
Now / Later / Park / Let go.
The point is not to do more.
It is to make a little room in your head.
■ When to use it
- Before bed, when your mind starts running.
- When the same thought keeps looping.
- When task managers have started to feel heavy.
- When you want to be heard, but do not want to send it to anyone.
- When talking out loud helps you understand what you mean.
- When an idea appears before it has a shape.
- When you do not want to forget something, but it is not ready to act on.
- When voice feels easier than typing.
- When your hands are busy: driving, cooking, getting ready, or moving through the day.
■ The 4 ways
Now — Something that may feel lighter if you look at it soon.
Later — Something to return to at another time.
Park — An idea, feeling, or question that does not need an answer yet.
Let go — A worry or thought you may not need to keep holding.
These are not priorities or scores.
They are quiet ways to hold what you said.
■ How KUU is different
- Unlike a notes app, KUU starts with speaking, not writing.
- Unlike a task manager, KUU does not turn every thought into something to do.
- Unlike an AI chat, KUU does not give long advice or add more things to think about.
KUU receives what you said and separates it into smaller, easier pieces.
■ What you can do
- Speak naturally, even when your thoughts are all mixed up.
- See your words as text.
- See only what needs your attention now.
- Keep later thoughts, parked ideas, and things to let go in their own places.
- Revisit what you have said when you want to.
■ Voice and data
- Raw audio is not kept.
- What you said is saved as text so you can look back later.
- Sorting uses AI. Only your words as text are sent, and nothing is kept.
- Your saved text syncs only to your private iCloud.
- Other people, and the app developer, cannot read it.
■ On your Mac
KUU waits quietly in the menu bar.
You can speak without opening a window, and it carries all the way through to
Now / Later / Park / Let go.
What you said before is always a glance away.
KUU is not here to add more thoughts.
It is here for the space between:
“I do not need to solve this right away”
and
“I do not want to keep holding it in my head.”
— Speaking makes room in your mind.
Terms of Use: https://kuu-zen.com/en/terms/
Privacy Policy: https://kuu-zen.com/en/privacy/
Latest updates
2.18.2
KUU 2.18.2 をお届けします。
【2.18.2 アップデート内容】
■ 共有の画面が、真っ白にならないように
手放したことを画像で共有するとき、1回目だけ共有の画面が真っ白になることがある問題を直しました。
■ 多いときも、すべて画像に
手放したことが多いと、画像にできないことがありました。20件ずつ何枚かに分けて、すべて書き出せます。
これからも、あたまの中に余白が戻る時間を、そっとお手伝いします。
2.18.1
Here's KUU 2.18.1.
We've made a few small improvements.
As always, we're here to help a little space return to your mind.
2.17.0
這是KUU 2.17.0。
【2.17.0 更新內容】
■ 打開iPhone Duo，雙頁展開
打開後的畫面上，左邊說話，右邊看清單。說完之後，四個分類也會在雙頁上橫向排成一排。
■ 四個分類，橫向排開
打開iPhone Duo或橫放iPad時，只要一個按鈕，就能把清單的四個分類橫向排成一排。
■ 選好的檔案夾，保持不變
把清單往下收起，或停止錄音回來後，之前選的檔案夾也會繼續保留。
我們會繼續靜靜地幫你，把留白帶回頭腦裡。
Store changes
What KUU: Overthinking Brain Dump changed on its store page: name, icon, screenshots, price, size, languages, requirements.
New iPad screenshots
New screenshots
8 screenshots (was 10)
Renamed
KUU - ADHDや考えごとが多い人のAIメモアプリ → KUU - 考えごとが多い人のAIメモアプリ｜ADHDにも
